5.0V Clock required - Use 3.3V CMOS Clock

Written by on 4/30/2010

The 5V CMOS clock oscillators are declining in availability. This is a solution to use the readily available 3.3V clock oscillators.

 The Pletronics SM33xxT, SM44xxT, SM55xxT, SM77xxH and SM77xxD families of 3.3V oscillators can be used with this circuit to fulfill the need for a 5.0V clock oscillator. The resulting signal characteristics will be equal to or better than the older 5V clock oscillators.

 The Fairchild NC7SZ126 Tri-State Buffer is readily available and costs about $0.055US in 1K volume.